Chest / Bust
Place measuring tape under your arms, keeping the tape level around the fullest part of your bust/chest.
Waist
Place the measuring tape at the narrowest point of your natural waist and measure around the waist.
Bum / Seat
Place the tape measure around the fullest part of your seat/bum, keeping the tape level but not tight.
Thigh
Place the tape measure around the fullest part of your thigh (5cm below crotch), keeping the tape level but not tight.